Calcutta, Sept.4 :    Calcutta, Sept.4:  Thirty-one people, including 14 couples, were arrested in a hotel at Diamond Harbour in South 24-Parganas, about 40 km from Calcutta, for alleged involvement in the flesh trade. Among those arrested were the hotel's owner, the manager and a pimp. Acting on a tip-off, a large police team raided the hotel and found the couples in compromising positions. The officer-in-charge of Diamond Harbour police station, who was part of the team, said on Monday he had visited the hotel pretending to be a customer. 'After reaching the hotel, I booked a room and ordered a bottle of liquor and some food. I alerted my senior officers and other policemen who were standing outside. Immediately afterwards, they entered the hotel in a body and started to raid one room after another.' Among those arrested were a lawyer of Alipore court and a senior officer of Calcutta Telephones. Even a mother and her 18-year-old daughter were picked up during the raid. Most of the arrested persons were from Behala, Thakurpukur, Garia, Bauria in Howrah and Swarup Nagar at Bongaon, in North 24-Parganas. All the arrested persons belong to upper middle-class families. A large quantity of liquor and other objectionable items were found in the hotel rooms. The hotel owner and manager, too, were picked up to avoid allegations that the arrests were made in connivance with the hotel management to extract money from the arrested persons, police said. All the arrests were made under the Immoral Traffic Act. Police added that the raid was conducted after some hoteliers complained about rivals involved in the flesh trade. They complained that this was also tarnishing the image their establishments. Earlier, 42 persons were arrested in another hotel under the Immoral Traffic Act. Special drives will be conducted before and during the Pujas so bona fide tourists are not harassed, police added. Such raids were also conducted in the resorts in the Bishnupur area, 20 km from Calcutta, on way to Diamond Harbour. A number of arrests were made there on complaints from local people and different social organisations. Asit Bose, chairman of Diamond Harbour municipality, said: ' We are considering measures for putting a stop to such activities forever. It only vitiates the atmosphere of this place.'